Answer:
population is the right answer.
In contrast to the stratified squamous epithelium of the skin, the intestinal barrier is composed of a single layer of columnar epithelial cells However, this single layer of intestinal epithelial cells is made of diverse cell types with absorptive, secretory, and immune function
Answer:
4) to aid in the transmission of an impulse, neurotransmitters are secreted into a synapse
They are used in direction of animals
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